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The strictfp modifier can be used with a class, method, or interface:

An expression is FP-strict when any of the containing classes, methods, or interfaces is declared to be strictfp. Constant expressions containing floating-point operations are also evaluated strictly. All compile-time constant expressions are by default FP-strict.

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strictfp class Example {
  double d = 0.0;

  public void example() {
    float f = Float.MAX_VALUE;
    float g = Float.MAX_VALUE;
    this.d = f * g;
    System.out.println("d (" + this.d + ") might not be equal to " +
                       (f * g));
  }

  public static void main(String[] args) {
    Example ex = new Example();
    ex.example();
  }
}

Exceptions

NUM06NUM53-J-EX0: This rule applies only to calculations that require consistent floating-point results on all platforms. Applications that lack this requirement need not comply.

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Failure to use the strictfp modifier can result in nonportable, implementation-defined behavior with respect to the behavior of floating-point operations.

Related Guidelines

Bibliography

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